Silicon Valley / San Jose Business Journal -- In the end, it was the property owner’s offer to literally build a bridge that sealed the deal to keep Accuray Inc. on Chesapeake Terrace in Sunnyvale. Dave Vanoncini, a broker with GVA Kidder Mathews in Santa Clara, said in a marketplace awash in vacancy — almost half of all Sunnyvale’s commercial buildings are vacant — the medical device developer Accuray had a lot of options.